CVE-2026-12900

MEDIUMPre-NVD 6.46.4
EchelonGraph scoreMEDIUM confidence

“—” beside the score: it is equal to the CVSS score beside it.

Score 6.4 from GitHub Security Advisory published 2026-07-21. A secondary CVSS source baseline 6.4; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: EPSS, GitHub Security Advisory, a secondary CVSS source
6.4EG
EchelonGraph verdictMonitorRemediate within your standard update timelines (the SSVC decision on this page).
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 0.3%CVSS: 6.4Exploit: None knownExposed services: Not assessed

No fix is confirmed yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for the fix.

The CVE record's CNA (Wordfence) lists brainstormforce Spectra Legacy – Gutenberg Blocks versions up to and including 2.19.28 as affected. No release containing a fix is confirmed on record.

The Spectra Gutenberg Blocks – Website Builder for the Block Editor plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the uagb/image block in all versions up to, and including, 2.19.28 due to insufficient input sanitization and output escaping. This makes it possible for authenticated attackers, with Contributor-level access and above, to inject arbitrary web scripts in pages that will execute whenever a user accesses an injected page.

CVSS v3
6.4
EG Score
6.4MEDIUMmedium confidence
EG Risk
29
EG Risk 29/100

EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).

How it’s computed (value × EchelonGraph’s weight)
Severity64% × 45%
The EG Score, 6.4 of 10.
Exploitation0.3% × 40%
FIRST EPSS: the 30-day exploitation probability when EchelonGraph scored this CVE.
Automatability0% × 15%
CISA's SSVC Automatable value: no (Vulnrichment).
SSVC (CISA's decision table, applied by EchelonGraph): Track at every mission impact level.
Exploitation none (CISA Vulnrichment) · Automatable no (CISA Vulnrichment) · Technical impact partial (CISA Vulnrichment). All three are CISA's SSVC values (Vulnrichment). EchelonGraph applied CISA's decision table to them; CISA publishes SSVC inputs and the table, not a decision for each CVE.
Action: No fix is confirmed yet. Restrict network exposure of the affected system or apply the vendor's mitigation within your standard update timelines, and watch the vendor's advisory for the fix.
EPSS PROB
0.3%
EPSS %ILE
23rd
KEV
Not listed

SSVC (CISA's decision table, applied by EchelonGraph)Track at every mission impact level.

No fix is confirmed yet. Restrict network exposure of the affected system or apply the vendor's mitigation within your standard update timelines, and watch the vendor's advisory for the fix.

Exploitation none (CISA Vulnrichment) · Automatable no (CISA Vulnrichment) · Technical impact partial (CISA Vulnrichment). All three are CISA's SSVC values (Vulnrichment). EchelonGraph applied CISA's decision table to them; CISA publishes SSVC inputs and the table, not a decision for each CVE. Mission impact is CISA's Mission & Well-being decision point, and only you can judge it. CISA's table makes it high when Mission Prevalence is Essential — the vulnerable component "directly provides capabilities that constitute at least one MEF for at least one entity" (MEF: mission essential function) — or when Public Well-Being Impact is Irreversible: "multiple fatalities are likely", the cyber-physical system "is likely lost or destroyed", "extreme or serious externalities" are imposed on other parties, or social systems such as elections or the financial grid "are destabilized and potentially collapse". CISA's decision table

BOD 26-04 (CISA's remediation timeline, Table 1)60 days if the affected system is publicly exposed; Fix on system upgrade if it is not.

In CISA KEV no (CISA's KEV catalog) · Automatable no (CISA Vulnrichment) · Technical impact partial (CISA Vulnrichment). Whether your system is publicly exposed is yours to answer. BOD 26-04 binds US Federal Civilian Executive Branch agencies; for anyone else it is CISA's published timeline, a reference rather than an obligation. The directive · how EchelonGraph applies it

Published

July 20, 2026

Last Modified

July 22, 2026

References (3)

Vendor Advisories for CVE-2026-12900(1)

These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Data Freshness Timeline

(refreshed 11× in last 7d / 38× in last 30d)

Each row is a time one of our pipelines fetched, updated or re-scored this CVE. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. An arrow marks a change the record states ("CVSS v3 → 9.1"); EPSS and GHSA rows show the values recorded at that time, not what changed (EPSS values are rounded; hover one for the exact figures). Most recent first.

Showing the most recent 100 of 169 refreshes on record for this CVE.

A repeat, a row identical to one the same pipeline wrote less than 10 seconds earlier, is not a separate refresh and is not counted. None are among the latest 100 rows. The 69 oldest rows on record are not shown and were not checked, so the counts can still include repeats.

  1. 2026-10-13 16:33 UTCEPSS rescoreEPSS 0.3% · 23rd percentile
  2. 2026-10-12 16:36 UTCEG score recompute
  3. 2026-10-12 16:33 UTCEPSS rescoreEPSS 0.3% · 23rd percentile
  4. 2026-10-11 20:12 UTCEG score recompute
  5. 2026-10-11 18:24 UTCEG score recompute
  6. 2026-10-11 14:57 UTCEG score recompute
  7. 2026-10-11 13:48 UTCEPSS rescoreEPSS 0.3% · 23rd percentile
  8. 2026-10-10 19:59 UTCEPSS rescoreEPSS 0.3% · 23rd percentile
  9. 2026-10-09 20:06 UTCEPSS rescoreEPSS 0.3% · 23rd percentile
  10. 2026-10-08 17:11 UTCEPSS rescoreEPSS 0.3% · 23rd percentile
  11. 2026-10-07 23:47 UTCEPSS rescoreEPSS 0.3% · 23rd percentile
  12. 2026-10-06 15:17 UTCEPSS rescoreEPSS 0.3% · 22nd percentile
  13. 2026-10-05 17:42 UTCEPSS rescoreEPSS 0.3% · 22nd percentile
  14. 2026-10-04 23:21 UTCEPSS rescoreEPSS 0.3% · 22nd percentile
  15. 2026-10-04 14:53 UTCEG score recompute
  16. 2026-10-04 14:53 UTCGHSA enrichmentGHSA-3rp7-f8f5-j67m · GitHub CVSS 6.4
  17. 2026-10-03 14:25 UTCEPSS rescoreEPSS 0.3% · 22nd percentile
  18. 2026-10-01 19:49 UTCEPSS rescoreEPSS 0.3% · 22nd percentile
  19. 2026-10-01 07:39 UTCEG score recompute
  20. 2026-10-01 07:39 UTCGHSA enrichmentGHSA-3rp7-f8f5-j67m · GitHub CVSS 6.4
  21. 2026-09-30 15:02 UTCEPSS rescoreEPSS 0.3% · 22nd percentile
  22. 2026-09-29 15:20 UTCEPSS rescoreEPSS 0.3% · 22nd percentile
  23. 2026-09-28 13:50 UTCEPSS rescoreEPSS 0.3% · 22nd percentile
  24. 2026-09-28 06:17 UTCEG score recompute
  25. 2026-09-28 06:17 UTCGHSA enrichmentGHSA-3rp7-f8f5-j67m · GitHub CVSS 6.4
Show 75 more
  1. 2026-09-26 15:58 UTCEPSS rescoreEPSS 0.3% · 22nd percentile
  2. 2026-09-24 03:27 UTCEG score recompute
  3. 2026-09-24 03:27 UTCGHSA enrichmentGHSA-3rp7-f8f5-j67m · GitHub CVSS 6.4
  4. 2026-09-23 13:47 UTCEPSS rescoreEPSS 0.3% · 25th percentile
  5. 2026-09-23 01:35 UTCEG score recompute
  6. 2026-09-23 01:35 UTCGHSA enrichmentGHSA-3rp7-f8f5-j67m · GitHub CVSS 6.4
  7. 2026-09-20 20:15 UTCEPSS rescoreEPSS 0.3% · 25th percentile
  8. 2026-09-18 19:27 UTCEPSS rescoreEPSS 0.3% · 25th percentile
  9. 2026-09-18 03:54 UTCEG score recompute
  10. 2026-09-18 03:54 UTCGHSA enrichmentGHSA-3rp7-f8f5-j67m · GitHub CVSS 6.4
  11. 2026-09-16 12:45 UTCEG score recompute
  12. 2026-09-16 12:45 UTCGHSA enrichmentGHSA-3rp7-f8f5-j67m · GitHub CVSS 6.4
  13. 2026-09-16 05:14 UTCEPSS rescoreEPSS 0.3% · 24th percentile
  14. 2026-09-13 16:46 UTCEPSS rescoreEPSS 0.3% · 24th percentile
  15. 2026-09-13 14:23 UTCEG score recompute
  16. 2026-09-13 14:23 UTCGHSA enrichmentGHSA-3rp7-f8f5-j67m · GitHub CVSS 6.4
  17. 2026-09-12 15:00 UTCEPSS rescoreEPSS 0.3% · 24th percentile
  18. 2026-09-12 12:34 UTCEG score recompute
  19. 2026-09-12 12:34 UTCGHSA enrichmentGHSA-3rp7-f8f5-j67m · GitHub CVSS 6.4
  20. 2026-09-11 14:52 UTCEPSS rescoreEPSS 0.3% · 24th percentile
  21. 2026-09-11 09:36 UTCEPSS rescoreEPSS 0.3% · 24th percentile
  22. 2026-09-11 09:18 UTCEG score recompute
  23. 2026-09-11 09:18 UTCGHSA enrichmentGHSA-3rp7-f8f5-j67m · GitHub CVSS 6.4
  24. 2026-09-10 09:34 UTCEPSS rescoreEPSS 0.3% · 24th percentile
  25. 2026-09-09 11:47 UTCEG score recompute
  26. 2026-09-09 11:47 UTCGHSA enrichmentGHSA-3rp7-f8f5-j67m · GitHub CVSS 6.4
  27. 2026-09-08 22:00 UTCEPSS rescoreEPSS 0.3% · 24th percentile
  28. 2026-09-07 22:48 UTCEG score recompute
  29. 2026-09-07 22:48 UTCGHSA enrichmentGHSA-3rp7-f8f5-j67m · GitHub CVSS 6.4
  30. 2026-09-06 13:47 UTCEPSS rescoreEPSS 0.3% · 24th percentile
  31. 2026-09-06 11:29 UTCEG score recompute
  32. 2026-09-06 11:28 UTCGHSA enrichmentGHSA-3rp7-f8f5-j67m · GitHub CVSS 6.4
  33. 2026-09-05 09:21 UTCEG score recompute
  34. 2026-09-05 09:21 UTCGHSA enrichmentGHSA-3rp7-f8f5-j67m · GitHub CVSS 6.4
  35. 2026-09-04 05:06 UTCEPSS rescoreEPSS 0.3% · 24th percentile
  36. 2026-09-02 14:11 UTCEPSS rescoreEPSS 0.3% · 24th percentile
  37. 2026-09-02 01:02 UTCEG score recompute
  38. 2026-09-02 01:02 UTCGHSA enrichmentGHSA-3rp7-f8f5-j67m · GitHub CVSS 6.4
  39. 2026-09-01 13:53 UTCEPSS rescoreEPSS 0.3% · 24th percentile
  40. 2026-08-31 04:19 UTCEG score recompute
  41. 2026-08-31 04:19 UTCGHSA enrichmentGHSA-3rp7-f8f5-j67m · GitHub CVSS 6.4
  42. 2026-08-30 19:17 UTCEPSS rescoreEPSS 0.3% · 24th percentile
  43. 2026-08-30 02:29 UTCEG score recompute
  44. 2026-08-30 02:28 UTCGHSA enrichmentGHSA-3rp7-f8f5-j67m · GitHub CVSS 6.4
  45. 2026-08-30 01:21 UTCEPSS rescoreEPSS 0.3% · 24th percentile
  46. 2026-08-28 21:40 UTCEPSS rescoreEPSS 0.3% · 24th percentile
  47. 2026-08-27 23:46 UTCEG score recompute
  48. 2026-08-27 23:46 UTCGHSA enrichmentGHSA-3rp7-f8f5-j67m · GitHub CVSS 6.4
  49. 2026-08-27 14:24 UTCEPSS rescoreEPSS 0.3% · 24th percentile
  50. 2026-08-26 21:41 UTCEG score recompute
  51. 2026-08-26 21:41 UTCGHSA enrichmentGHSA-3rp7-f8f5-j67m · GitHub CVSS 6.4
  52. 2026-08-25 14:48 UTCEG score recompute
  53. 2026-08-25 14:48 UTCGHSA enrichmentGHSA-3rp7-f8f5-j67m · GitHub CVSS 6.4
  54. 2026-08-25 13:48 UTCEPSS rescoreEPSS 0.3% · 24th percentile
  55. 2026-08-24 12:59 UTCEG score recompute
  56. 2026-08-24 12:59 UTCGHSA enrichmentGHSA-3rp7-f8f5-j67m · GitHub CVSS 6.4
  57. 2026-08-23 11:08 UTCEG score recompute
  58. 2026-08-23 11:08 UTCGHSA enrichmentGHSA-3rp7-f8f5-j67m · GitHub CVSS 6.4
  59. 2026-08-23 00:19 UTCEPSS rescoreEPSS 0.2% · 8th percentile
  60. 2026-08-22 09:19 UTCEG score recompute
  61. 2026-08-22 09:19 UTCGHSA enrichmentGHSA-3rp7-f8f5-j67m · GitHub CVSS 6.4
  62. 2026-08-21 23:48 UTCEPSS rescoreEPSS 0.2% · 8th percentile
  63. 2026-08-21 07:30 UTCEG score recompute
  64. 2026-08-21 07:30 UTCGHSA enrichmentGHSA-3rp7-f8f5-j67m · GitHub CVSS 6.4
  65. 2026-08-20 22:55 UTCEPSS rescoreEPSS 0.2% · 8th percentile
  66. 2026-08-20 05:41 UTCEG score recompute
  67. 2026-08-20 05:41 UTCGHSA enrichmentGHSA-3rp7-f8f5-j67m · GitHub CVSS 6.4
  68. 2026-08-19 17:03 UTCEPSS rescoreEPSS 0.2% · 8th percentile
  69. 2026-08-19 03:51 UTCGHSA enrichmentGHSA-3rp7-f8f5-j67m · GitHub CVSS 6.4
  70. 2026-08-18 02:01 UTCEG score recompute
  71. 2026-08-18 02:01 UTCGHSA enrichmentGHSA-3rp7-f8f5-j67m · GitHub CVSS 6.4
  72. 2026-08-17 00:08 UTCEG score recompute
  73. 2026-08-17 00:08 UTCGHSA enrichmentGHSA-3rp7-f8f5-j67m · GitHub CVSS 6.4
  74. 2026-08-16 14:56 UTCEPSS rescoreEPSS 0.2% · 8th percentile
  75. 2026-08-16 02:14 UTCEPSS rescoreEPSS 0.2% · 8th percentile

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-12900?
CVE-2026-12900 is a medium-severity vulnerability; its CVE record was published on July 20, 2026. The Spectra Gutenberg Blocks – Website Builder for the Block Editor plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the uagb/image block in all versions up to, and including, 2.19.28 due to insufficient input sanitization and output escaping. This makes it possible for…
When was the CVE record for CVE-2026-12900 published?
The CVE record for CVE-2026-12900 was published on July 20, 2026. That is the record's publication date; the vulnerability itself may have been made public earlier. EchelonGraph's copy of the record carries a last-modified date of July 22, 2026; the record at its source may have been updated since.
Is CVE-2026-12900 actively exploited?
CVE-2026-12900 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.3% probability of exploitation in the next 30 days (23rd percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-12900?
CVE-2026-12900 has a CVSS base score of 6.4 (a secondary CVSS source that NVD displays; NVD's own analysis pending).
How do I remediate CVE-2026-12900?
No fix for CVE-2026-12900 is confirmed yet. Until one is published, restrict network exposure of the affected system or apply the vendor's mitigation — for example, keep it off the internet or limit it to trusted networks — and watch the vendor's advisory for the fix. The CVE record's CNA (Wordfence) lists brainstormforce Spectra Legacy – Gutenberg Blocks versions up to and including 2.19.28 as affected. No release containing a fix is confirmed on record. The vendor advisories EchelonGraph has for CVE-2026-12900 are linked in the Vendor Advisories panel on this page.

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